HackingFinancial ServicesFinanceStolen CredentialsData ExfiltratedCustomer Data InvolvedPIIIdentity (basic)Government IDFinancial accountHighContained

HIGHTOWER HOLDING, LLC

bd_cc7ac8b88135f6ba · schema v1 · pii pii-v1

Severity

High

Discovered

Jan 9, 2026

Filed

Mar 24, 2026

To disclose

11 weeks

Affected

4,888state residents only

Linked

9 filings

Confidence

64%

Full breach record for HIGHTOWER HOLDING, LLC →

Hightower Holding, LLC notified Massachusetts residents of two incidents involving compromised user accounts. Unauthorized access occurred between Jan 8-9 and Jan 19-20, 2026, with discovery on Jan 9, 2026. Files were downloaded without authorization. The company engaged forensic specialists, secured networks, and offered 12 months of credit monitoring. No specific data types were listed in the provided text, but PII is implied by the nature of the breach and credit monitoring offer.

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Massachusetts clock⏱ MA AG >30d11 weeks discovery → filing

Incident timeline

undetected · 1 days

discovery → filing · 11 weeks / 74 days

Jan 8, 2026

Begins

Jan 9, 2026

Discovered

Mar 24, 2026

Filed

vs. sector median

+2 wks slower

This filing is one of 9 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (8) · sorted by filing gap

Maine State AGbd_9ab4cb833accec1b2026-03-24Verified
Texas State AGbd_6ed226a1f4fa64d62026-03-25 · +1dVerified
Vermont State AGbd_11c694a16108e78e2026-03-23 · +1dVerified
Washington State AGbd_618ac39ae73afd622026-03-23 · +1dCandidate

Show 4 more filings ↓up to 23d gap

New Hampshire State AGbd_63d000b1f7a591922026-03-23 · +1dVerified
Indiana State AGbd_79f3f287285213732026-03-23 · +1dVerified
Maine State AGbd_88f8377542b021452026-03-23 · +1dVerified
Illinois State AGbd_b618d47c063c96c42026-03-01 · +23dVerified

Name: HIGHTOWER HOLDING, LLC
norm: hightower holding
Domain: hightoweradvisors.com

Name: HIGHTOWER HOLDING, LLC
norm: hightower holding
Domain: hightoweradvisors.com
Industry: Financial Servicesllm

Discovered: Jan 9, 2026
Breach occurred: Jan 8, 2026 – Jan 20, 2026
Undetected for: 1 dayoccurrence → discovery
Materiality determined: —
Notification sent: Mar 23, 2026
Affected individuals: 4,888state-resident count only
Data types: PIIIdentity (basic)Government IDFinancial account
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1041 Exfiltration Over C2 Channel
Threat actor: External
Initial access: valid_credentials

During the incident: Took steps to secure our network
Initiated a comprehensive investigation with the assistance of third-party cybersecurity and digital forensic specialists
Reassessed the security of our network
Initiated a second comprehensive investigation with the assistance of third-party cybersecurity and digital forensic specialists
Engaged third-party data review specialists to conduct a time-intensive and thorough review of the files
Offering immediate access to complimentary single bureau credit monitoring and fraud assistance for twelve (12) months
Changes made: Undertaken additional measures to further strengthen the Company’s cybersecurity posture even with respect to credentialed users
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 11 weeks(74 days from discovery to filing)
Compliance flags: MA AG >30d
Discovery-date grounding: letter-groundedThe discovery date is the detection date narrated in the notification letter — the defensible tier.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 9 filings · 8 states

View merged incident ↗

Illinois State AGMar 1 · first

Vermont State AG+22d

Washington State AG+22d

New Hampshire State AG+22d

Indiana State AG+22d

Maine State AG+22d

Maine State AG+23d

Massachusetts State AG+23d · this page

Texas State AG+24d

Pattern: first filing Mar 1 (IL), last Mar 25 (TX) — a 24-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

Evidence ladder

Leak-site claim

Attacker assertion only. Establishes: claim date, group, alleged victim.

Press / market report

Unlocks: incident narrative, operational impact. Still no compliance clock.

State AG / regulator filingThis record

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statement

Unlocks: materiality, stated response, full audit trail. Ceiling removed.

Source URL: https://www.mass.gov/doc/2026-447-hightower-holding-llc/download
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Mar 24, 2026
Raw hash: 24b58be308cb83db84ca1ca3ee5164e94d7a75109bb91b9397cb45d84574bca7

Linked disclosures

Regulatory filings (8) · sorted by filing gap

Reporting entityHIGHTOWER HOLDING, LLC

Victim entityHIGHTOWER HOLDING, LLC

Incidentdiscovered Jan 9, 2026

Stated responseTook steps to secure our network

ComplianceMA AG >30d

Extraction provenanceno artifact recorded

Source provenancewww.mass.gov